Électrolyse d'une solution de bromure de cuivre : illustrations

\documentclass{article}
\usepackage[a4paper,margin=2cm]{geometry}
\usepackage[T1]{fontenc}
\usepackage[latin1]{inputenc}
%\usepackage[garamond]{mathdesign}
\usepackage{pstricks,multido,pst-grad}
\definecolor{Orange}{rgb}{1,0.65,0}
% le tube en U de diamètre 1cm
% de hauteur 5 cm
\def\psTubeU{%
        \pscustom[linestyle=none]{%
        \psline(-2,3)(-2,0)
        \psarc(0,0){2}{180}{0}
        \psline(2,0)(2,3)(1,3)(1,0)
        \psarcn(0,0){1}{0}{180}
        \psline(-1,0)(-1,3)(-2,3)}}
\def\psContourTubeU{%
       \pscustom[linewidth=2\pslinewidth]{%
        \psline(-2,3)(-2,0)
        \psarc(0,0){2}{180}{0}
        \psline(2,0)(2,3)}
       \pscustom[linewidth=2\pslinewidth]{%
        \psline(1,3)(1,0)
        \psarcn(0,0){1}{0}{180}
        \psline(-1,0)(-1,3)}}
%%%%%%%%%%%%%%%%%
 \def\electrode{
  \psframe*[linecolor=black](-0.1,0)(0.1,4.5)
  \psframe*[linecolor=Orange](-0.15,4.2)(0.15,4.5)}
\psset{dimen=middle}
\begin{document}
\begin{center}
\begin{pspicture}[showgrid=false](-3,-4)(3,7)
\begin{psclip}{\psTubeU}
% liquide
\psframe*[linecolor=cyan!20](-3,-2)(3,1.5)
\end{psclip}
\psContourTubeU
\rput(-1.5,0){\electrode}
\rput(1.5,0){\electrode}
\psline[linewidth=3\pslinewidth](-0.1,6.3)(-0.1,6.7)
\psline(0.1,6)(0.1,7)
\uput[45](0.1,6.5){$+$}
\uput[135](-0.1,6.5){$-$}
\psline(-1.5,4.5)(-3,4.5)(-3,6.5)(-0.1,6.5)
\psline(1.5,4.5)(3,4.5)(3,6.5)%(0.1,6.5)
\psline(0.1,6.5)(1,6.5)
\psline(2,6.5)(3,6.5)
\psline[linewidth=2\pslinewidth](1,6.5)(2.1,6.7)
\psdot(2,6.5)
\pscircle[fillstyle=solid](1,6.5){0.1}
\pscircle[fillstyle=solid](-3,5.5){0.5}
\rput(-3,5.5){mA}
\psline{*-*}(-3,4.75)(3,4.75)
\pscircle[fillstyle=solid](0,4.75){0.5}
\rput(0,4.75){V}
\uput[135](-0.5,4.75){\footnotesize \textsc{com}}
\uput[135](-3,6){\footnotesize \textsc{com}}
\psline{->}(0.75,2)(1.4,2)
\psline{->}(-0.75,2)(-1.4,2)
\rput(0,2){\shortstack{électrodes\\ de graphite}}
\psline{-*}(0,-2.5)(0,-1.5)
\uput[d](0,-2.5){\small \shortstack{solution\\ de bromure\\ de cuivre(II)}}
\end{pspicture}
\end{center}
\begin{center}
\begin{pspicture}[showgrid=false](-3,-4)(3,7)
\begin{psclip}{\psTubeU}
% liquide
\psframe*[linecolor=cyan!20](-3,-2)(3,1.5)
\psframe*[linecolor=Orange](0,0.5)(3,1.5)
\psframe[linestyle=none,fillstyle=gradient,gradbegin=Orange,gradend=cyan!20,gradmidpoint=1](0,-0.2)(3,0.5)
\end{psclip}
\psContourTubeU
\rput(-1.5,0){\electrode}
\rput(1.5,0){\electrode}
\psline[linewidth=3\pslinewidth](-0.1,6.3)(-0.1,6.7)
\psline(0.1,6)(0.1,7)
\uput[45](0.1,6.5){$+$}
\uput[135](-0.1,6.5){$-$}
\psline(-1.5,4.5)(-3,4.5)(-3,6.5)(-0.1,6.5)
\psline(1.5,4.5)(3,4.5)(3,6.5)%(0.1,6.5)
\psline(0.1,6.5)(1,6.5)
\psline(2,6.5)(3,6.5)
\psline[linewidth=2\pslinewidth](1,6.5)(2.1,6.5)
\psdot(2,6.5)
\pscircle[fillstyle=solid](1,6.5){0.1}
\pscircle[fillstyle=solid](-3,5.5){0.5}
\rput(-3,5.5){mA}
\psline{*-*}(-3,4.75)(3,4.75)
\pscircle[fillstyle=solid](0,4.75){0.5}
\rput(0,4.75){V}
\uput[135](-0.5,4.75){\footnotesize \textsc{com}}
\uput[135](-3,6){\footnotesize \textsc{com}}
\psline{->}(2.5,0.75)(1.7,0.75)
\uput[0](2.5,0.75){\shortstack{formation de\\ $\mathrm{Br_2}$ (orangé)}}
\rput(-1.5,0){\psframe*[linecolor=red](-0.1,0)(0.1,1.5)}
\psline{->}(-2.5,0.75)(-1.6,0.75)
\uput[l](-2.3,0.75){\shortstack{dépôt \\de cuivre}}
\end{pspicture}
\end{center}
\end{document}